Sunroof won't open. Sometimes!

Change the switch?

That's the problem, it's all buried in the headlining. Also given the complexity of the mechanism I suspect there are several switches/contacts involved throughout the roof. Can't be an electronic controller for a sunroof, surely!

In message , PC Paul writes

You're right about the way it's supposed to work: It should be two separate pushes to open: The first takes it to the 'tilt' position and stops, while the second tilts it further then slides it all the way back.

Mine had a habit of sticking at the fully tilted position until the dealer sorted it (lubricating the rails, which you've already tried.) In the meantime, I just used to raise it as far as it would go, give the panel a quick thump, and then press the button again to open it fully.

This sounds like it could be a problem with the switch that stops it when it gets to the 'tilt' position. If you can find it, you might as well see if you can bypass it - I never really saw the point in the stop at partial tilt anyway. The problem is that it would mean taking the headlining down.

The only other thing you could try is inserting the emergency winder handle (assuming that the car still has it) and seeing if it needs some assistance when it hits a particular point. I had a problem with the passenger door central locking on my 323F, and just repeatedly operating the door plunger a few times by hand sorted it out. I get the feeling that some of the motors they used on these cars aren't really strong enough for the job, though I reckon the headlight retractors would happily remove your fingers.